Fee-Based Revenue from Contracts with Customers (In-Scope Noninterest Income by Business Segment and Reconciliation to Consolidated Noninterest Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Noninterest income	$ 2,065	$ 2,086	$ 3,953	$ 3,958
Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	1,520	1,367	2,853	2,564
Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	430	450	894	943
Other
Disaggregation of Revenue [Line Items]
Noninterest income	177	339	388	639
Retail Banking
Disaggregation of Revenue [Line Items]
Noninterest income	748	706	1,493	1,360
Retail Banking | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	135	109	269	211
Retail Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	329	309	618	560
Retail Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	162	144	321	275
Retail Banking | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	626	562	1,208	1,046
Retail Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	122	144	285	314
Retail Banking | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	135	109	269	211
Retail Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	10	11	19	18
Retail Banking | Debit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	177	164	338	302
Retail Banking | Net credit card fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	63	57	118	104
Retail Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	52	47	93	79
Retail Banking | Other | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	27	30	50	57
Retail Banking | Deposit account fees | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	145	129	287	248
Retail Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	17	15	34	27
Retail Banking | Net credit card fees | In-Scope
Disaggregation of Revenue [Line Items]
Interchange fees	172	146	320	266
Credit card reward costs	109	89	202	162
Corporate & Institutional Banking
Disaggregation of Revenue [Line Items]
Noninterest income	968	867	1,772	1,674
Corporate & Institutional Banking | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	341	279	660	514
Corporate & Institutional Banking | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	9	10	17	20
Corporate & Institutional Banking | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	664	564	1,172	1,051
Corporate & Institutional Banking | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	304	303	600	623
Corporate & Institutional Banking | Treasury management fees | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	327	264	629	487
Corporate & Institutional Banking | Merchant services | Card and cash management
Disaggregation of Revenue [Line Items]
Noninterest income	14	15	31	27
Corporate & Institutional Banking | Other | Lending and deposit services
Disaggregation of Revenue [Line Items]
Noninterest income	9	10	17	20
Corporate & Institutional Banking | Residential and commercial mortgage
Disaggregation of Revenue [Line Items]
Noninterest income	33	35	64	66
Corporate & Institutional Banking | Capital markets related
Disaggregation of Revenue [Line Items]
Noninterest income	272	232	409	424
Corporate & Institutional Banking | Other
Disaggregation of Revenue [Line Items]
Noninterest income	9	8	22	27
Asset Management Group
Disaggregation of Revenue [Line Items]
Noninterest income	234	244	482	473
Asset Management Group | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	230	241	473	467
Asset Management Group | Total revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Noninterest income	230	241	473	467
Asset Management Group | Out-of-Scope
Disaggregation of Revenue [Line Items]
Noninterest income	4	3	9	6
Asset Management Group | Asset management fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	228	239	469	465
Asset Management Group | Brokerage fees | Asset management and brokerage
Disaggregation of Revenue [Line Items]
Noninterest income	2	2	4	2
Other
Disaggregation of Revenue [Line Items]
Noninterest income	$ 115	$ 269	$ 206	$ 451